Abnormal Rv Tlc Ratio

While fev1 improvement with bronchodilator may be a function of large airway reversibility lack of significant rv reversibility may indicate small airway closure that is non reversible.

Abnormal rv tlc ratio.

Aalternative ccriteria oof nnormality. A positive correlation was observed between rv to age r 0 4 and height r 0 3. Agreement and bias normal abnormal kappa bias p value plethysmography actual 40 40 79 5 yes 0 0006. A significant bronchodilator response was observed in 32 of the patients.

Abnormal rv tlc ratio was a superior criterion for diagnosing obstruction in asthma. Furthermore there was no correlation between fev1 reversibility and rv reversibility r 0 1 p 0 3 conclusions. Fifty two and fifty seven percent of the patients had abnormal residual volume and abnormal rv tlc ratio respectively. Abnormal rv tlc ratio was a superior criterion for diagnosing obstruction in asthma.

8 racial adjustment of predicted value most studies for normal values in us looked at caucasian populations of normals not apppp p g propriate for other ethnic groups if used in african american population more likely to seem abnormal 12 higher controversial. Adjustment of predicted value downward reduces the sensitivity of the test for detecting abnormality.